For several days I've not been able to get onto the Internet through WiFi.
I called BT and got a charming and very helpful young lady who was, unfortunately, Scottish.
Having worked out that when she said "richer" she meant "router" (not pronounced "row-ter" as the Americans do), we, between us, discovered that, since I was fine via Ethernet, it wasn't BT's connection but my "richer" that was faulty.
After a weekend without WiFi, I've now corrected that (it wasn't my router - it was my Apple WiFi unit that simply needed rebooting).
Isn't new technology complicated? Especially in Scottish.

my father talked like that and I couldn't understand a word he said.

It might be better to have a go at the person who employed her. You'll probably find that individual is English. I had a lovely time in England (Warwickshire) last weekend and to be honest I found it difficult at times to understand the locals. Then again, who cares?